This page explains the recovery process should you mistakenly try to upgrade your Confluence installation to a version beyond your current license entitlement.
During an upgrade an obvious indication that your license has expired can be found in your log file. You will see a 'WARN' level entry similar to this:
[confluence.upgrade.impl.DefaultUpgradeManager] isUpgradeAllowed Your license is now outside of its support period. You need to renew the license before you can upgrade to this version of Confluence. |
When you try to access the Confluence site in your browser, you will see the following warning screen:

